Abstract

                                The effect of different forms and lovels of liming materials on soil reaction was studied. Calcium carbonate, calcium hydroxide and calcium oxidu were added to rep rosentative black, red, alluvial and laterite soils at two levels namely 3 tons and 6 tons/ha. Moisture level was maintained at field capacity. Soil samples were drawn at different periods of incubation and pH was estimated. The increase in pH due to appli- cation of liming material was higher in laterite soil and low in black soil. Calcium oxide was found to cause the maximum shift in pH followed by calcium hydroxide and calcium carbonate. Application of six tons of liming material resulted in greater increase in pH than three tons/ha. The values for pH registered an increase in initial stage and than there was a drop in pH values, followed by steady increase thereafter.

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